DayDream Minimonitor   Shelf speaker as in Hobby Hifi 6/2021

Technical data
  • impedance: 4 Ohm
  • sensivity (2,83V/1m): 85 dB
  • size (HxWxD): 320 x 160 x 250 mm
  • frequency range (-8dB): 45 - 30000 Hz
  • crossover frequency(s): 700 Hz
  • speaker type: bass reflex

DayDream Minimonitor is a two way compact speaker.

DayDream Minimonitor is a bass-reflex cabinet loudspeaker with drivers of TECTONIC and Dayton Audio.

The kit is delivered with the following drivers:
- a TECTONIC TEBM46C20N-4B full range driver
- a Dayton Audio RS125-4 woofer

The loudspeaker has been developed by Bernd Timmermanns.

The crossover consists of:
- a 2nd order high-pass filter (12 dB per octave slope) for the full range driver.
- a 2nd order low-pass filter (12 dB per octave slope) for the woofer.

The frequency response of this speaker is nearly linear.

The decay spectrum is nearly perfect.

At medium volume, i.e. 90 dB at 1 m, the nonlinear distortions are below 1,2% above 200 Hz.

Our kit consists of

  • Dayton Audio RS125-4 5 inch Reference Woofer 4 Ohm. Black alu. cone
  • Full-range TECTONIC TEBM46C20N-4B
  • 0,5x PE sealing tape, 5x2 mm, 7.5 m
  • 0,5x Damping Sonofil 100 x 35 cm for 20 litres
  • Binding Post PK31, gold plated (one pair, red and black)
  • 2m Speaker cable 2x1.5 mm2, transparent
  • 1,5x Pan screws 4x20 black, torx, 8 pieces
  • Plan for DIY kit

the crossover components (right),
to be mounted on a small wooden board.

  • JB, electrolytic capacitor, bipolar, 100 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar, 220 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 15μF / 100 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 22μF / 100 Vdc
  • 0.7 mm air core coil, 0.27 mH/0.44 Ohm
  • 0.7 mm air core coil, 2.2 mH/1.3 Ohm
  • Audaphon M core coil M12, 1.5 mH/0.16 0hm
  • Mundorf ferrite core coil P50 10 mH/3.49Ohm
  • Metal-oxide resistor, 5W 1.2 Ohm (brown-red-gold)
  • Metal-oxide resistor, 5W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)

Kit without cabinet, price per speaker   EUR 174,00 excl. VAT: € 146.22 / $ 163.76

Kit with high-end crossover

The high-end kit is delivered with baked varnish air core coils on important parts of the crossover for minimizing microphonic effects. - The current flow through the coil creates a magnetic field which sets the reel of wire in motion. This motion induces a voltage in the coil which adds itself to the signal. The stiffer the reel of wire is, the less the signal will be altered. The capacitors for the TECTONIC TEBM46C20N-4B are of type polypropylen (MKP) Audaphon MKP CAP Superior 400 V.

  • Audaphon MKP CAP Superior 15 μF / 400 Vdc
  • JB, electrolytic capacitor, bipolar, 100 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar, 220 μF/50 Vdc
  • JB, electrolytic capacitor, bipolar advanced, 22μF / 100 Vdc
  • Mundorf baked varnish air core coil BL71, 0.27 mH/0.45 Ohm
  • Mundorf baked varnish air core coil BL71, 2.2 mH/1.3 Ohm
  • Mundorf ferrite core coil P50 10 mH/3.49Ohm
  • Mundorf H core Hepta Coil LH45, 1,5 mH/0.16 Ohm
  • Metal-oxide resistor, 5W 1.2 Ohm (brown-red-gold)
  • Metal-oxide resistor, 5W 2.7 Ohm (red-purple-gold)
  • Metal-oxide resistor, 5W 3.3 Ohm (orange-orange-gold)

Kit with high-end-crossover without cabinet, price per speaker   EUR 198,00 excl. VAT: € 166.39 / $ 186.35

Impedance correction

If you want to use a valve amplifier with this speaker an impedance correction should be employed. In this case the component quality is less important; therefore, we offer only one kit (upon request higher quality components are available).

  • Mundorf, electrolytic capacitor, etched, 56 μF/100 Vdc
  • ceramic resistor 5.6 Ohm/20 Watt

Price per impedance correction for one speaker, to be mounted on a small wooden board.     EUR 4,60 excl. VAT: € 3.87 / $ 4.33

universal PCB

If you prefer to mount the crossover components on a 159 x 127 mm universal PCB instead on wood:
Universal PCB RA160, order no.. str-RA160, price per unit:   EUR 5,90 excl. VAT: € 4.96 / $ 5.55
We recommend one board per kit (two boards for a speaker pair)


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